A long apprenticeship teaches you the content of a craft. It also does something less noticed: it trains you to see problems as the kind that exist in that craft. The 20th-century philosopher of science Imre Lakatos called this a 'research programme' — every tradition of inquiry carries a hard core of assumptions so fundamental that practitioners protect them reflexively, redirecting all anomalies outward onto peripheral theories rather than letting them touch the core. This isn't intellectual cowardice. It's how serious work gets done. The danger is that the protective belt eventually stops filtering noise and starts filtering reality. What this means practically is that your deepest competencies are also your most reliable blind spots — not because you are incurious, but because fluency in any domain converts what were once open questions into load-bearing walls. The question worth sitting with today is not whether you have a hard core of assumptions (you do), but whether you can identify even one thing inside it you have not examined in years.

What assumption inside your most developed skill or role have you not seriously questioned since you first learned it — and what would it cost you to be wrong about it?

Drawing from Philosophy of Science — Imre Lakatos